SMSC COM20020 - Manual
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Table of Contents:
- Page 2 – TABLE OF CONTENTS
- Page 3 – PIN CONFIGURATION; Ordering Information:
- Page 4 – DESCRIPTION OF PIN FUNCTIONS
- Page 5 – prior to the
- Page 6 – be left floating.; +5 Volt Power Supply pin.; Ground pin.
- Page 8 – PROTOCOL DESCRIPTION; NETWORK PROTOCOL; internal; DATA RATES; s. IDLE LINE Timeout for 156.2 Kbps is 82; NETWORK RECONFIGURATION
- Page 9 – BROADCAST MESSAGES; and bit 5 of the Setup; Response Time; S translates to a distance of about 4
- Page 12 – SYSTEM DESCRIPTION; MICROCONTROLLER INTERFACE; The signal on the A0
- Page 14 – FIGURE C
- Page 15 – TRANSMISSION MEDIA INTERFACE; The user; Traditional Hybrid Interface; termination, and node count for ARCNET nodes.; Backplane Configuration; configuration of the output driver)
- Page 16 – RBIAS
- Page 17 – valid only for Backplane
- Page 18 – FIGURE 6 - INTERNAL BLOCK DIAGRAM
- Page 19 – , available from Standard Microsystems Corporation.; FUNCTIONAL DESCRIPTION
- Page 20 – Table 2 - Read Register Summary
- Page 21 – Table 3 - Write Register Summary
- Page 22 – In; Tentative ID Register
- Page 23 – these bits exist in; Diagnostic Status Register; Writing to
- Page 24 – Configuration Register; SUBAD0 and SUBAD1; Setup Register
- Page 31 – FIGURE 7 - SEQUENTIAL ACCESS OPERATION
- Page 32 – Disable Interrupts
- Page 33 – Selecting RAM Page Size
- Page 34 – FIGURE 8 - RAM BUFFER PACKET CONFIGURATION
- Page 36 – Receive Sequence
- Page 37 – The device is designed such that the interrupt; Transmit Command Chaining
- Page 38 – Receive Command Chaining
- Page 40 – INITIALIZATION SEQUENCE; Bus Determination; IMPROVED DIAGNOSTICS
- Page 42 – OSCILLATOR; pull-up resistor is required on
- Page 43 – OPERATIONAL DESCRIPTION; TTL Levels
- Page 45 – Output and I/O pins capacitive load specified as follows:; pF
- Page 46 – TIMING DIAGRAMS
- Page 57 – D I M; FIGURE 18 - 28-PIN PLCC PACKAGE DIMENSIONS
- Page 58 – DIM; FIGURE 18A - 24-PIN DIP PACKAGE DIMENSIONS
COM20020
COM20020 ULANC
Universal Local Area Network Controller
with 2K x 8 On-Board RAM
FEATURES
•
24-Pin Embedded Network Controller/
Transceiver/RAM
•
Ideal for Industrial/Factory Automation
and Automotive Applications
•
Deterministic, 2.5 Mbps, Token Passing
ARCNET Protocol
•
Minimal Microcontroller and Media
Interface Logic Required
•
Flexible Microcontroller Interface for Use
with 80XX, 68XX, etc.
•
Automatically Detects Type of
Microcontroller Interface:
-
Non-Multiplexed or Multiplexed Bus
-
Separate nRD & nWR Lines or DIR &
nDS Lines
•
Full 2Kx8 On-Chip RAM
•
Command Chaining for Top Performance
•
Reduced Reconfiguration Times
•
Sequential Access to Internal RAM
•
Software Programmable Node ID
•
Duplicate Node ID Detection
•
Powerful Diagnostics
•
Receive All Mode
•
Data Rates from 2.5 Mbps to 156.25 Kbps
•
24-Pin DIP or 28-Pin PLCC Package
•
Flexible Media Interface:
-
Traditional Hybrid Interface for Long
Distances
-
RS485 Differential Driver Interface for
Low Cost, Low Power, High Reliability
-
Backplane Mode for Direct Connection to
Media in Short Distance Applications
•
Eight, 256-Byte Pages Allow 4 Pages TX
and RX Plus Scratch-Pad Memory
•
No Wait-State Arbitration
•
Programmable TXEN Polarity
•
Next ID Readable
•
Internal Clock Prescaler for Slower Network
Speed without Slowing Arbitration
•
Operating Temperature Range of -40
o
C to
+85
o
C, or 0
o
C to +70
o
C
•
Self-Reconfiguration Protocol
•
Supports up to 255 Nodes
•
Supports Various Network Topologies (Star,
Tree, Bus...)
•
CMOS, Single +5V Supply
GENERAL DESCRIPTION
SMSC's COM20020 is a member of the family
of Industrial Network Controllers from Standard
Microsystems Corporation. The device is a
special purpose communications controller for
networking microcontrollers and intelligent
peripherals in industrial, automotive, and
embedded control environments using an
ARCNET
®
protocol engine. The small 24-pin
package, flexible microcontroller and media
interfaces, eight-page message support, and
extended temperature range of the COM20020
make it the only true network
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Summary
2 TABLE OF CONTENTS FEATURES ........................................................................................................................................1 GENERAL DESCRIPTION ....................................................................................................................
3 controller optimized for use in industrial andautomotive applications. Using an ARCNETprotocol engine is the ideal solution for factoryautomation applications because it provides atoken-passing protocol, a highly reliable andproven networking scheme, and a data rate ofup to 2.5 Mbps when using the...
4 DESCRIPTION OF PIN FUNCTIONS DIP PIN NO. PLCC PIN NO. NAME SYMBOL DESCRIPTION MICROCONTROLLER INTERFACE 1-3 1-3 Address0-2 A0/nMUX,A1,A2/ALE Input. On a non-multiplexed bus, thesesignals are directly connected to the low bitsof the host address bus. On a multiplexedaddress/data bus, A0/nMUX is tie...
